SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f198c7e86a41d35562ff4c764244992c1a4bb0d2edb2425f6f9c7e99b2cb0c2f' 
  AND token = 'VKErY9UIlCuqr0EIOW/ADrz18BG3E+YBMYIwGZCSUD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}